Here is the latest Iowa news from The Associated Press…

DES MOINES, Iowa (AP) — An Iowa power utility is warning residents not to fall for a phone scam that has targeted power customers around the country. The Des Moines Register reports that MidAmerican Energy has received reports from its customers complaining of suspicious callers seeking personal data.

DENISON, Iowa (AP) — Authorities say an accident led to an explosion and fire at a recycling plant in western Iowa’s Denison. Sioux City television station KTIV reports that the fire occurred Friday and took only 20 minutes for firefighters to get under control. But Denison residents say the explosion rattled windows in the area.

CLEAR LAKE, Iowa (AP) — A swimming advisory has been issued for Clear Lake and McIntosh Woods state parks in north-central Iowa. The Mason City Globe Gazette reports that the advisories were issued after a water sample showed elevated levels of E. coli bacteria. The Iowa Department of Natural Resources says the sampling was taken earlier this week.

AMES, Iowa (AP) — David Johnson ran for a career-high 199 yards and two touchdowns and caught passes for two more scores to lead Northern Iowa past Iowa State 28-20 Saturday night. Northern Iowa, seeking a return to the FCS playoffs after a rare losing record in 2012, jumped to a 21-7 lead on a steamy evening in Ames. The Panthers handed the Cyclones their first season-opening loss in five seasons under ISU coach Paul Rhoads.